This model shows some more changes, and may represent the most production-ready Model S seen to date.

The primary changes from the Alpha build are at the rear end, where the tail lights look much more like the clear-and-red setups we see on real production cars than the monotone, concept-style lights on the Alpha build.

The door handles, likewise, are not the shaved/flush units on the Alpha, but recessed.

Finally, of the major changes, the side mirrors are enlarged in comparison to Tesla's official photos of the Model S.